use strict;
use warnings;
use HTML::TokeParser;

my @sections = qw/ Poster Date /;

my $p = HTML::TokeParser->new( 'test.html' );

while ( my $token = $p->get_token ) {
    my ( $type, $text ) = @$token;
    if ( $type eq 'C' ) {
        # we have an HTML comment
        foreach my $section ( @sections ) {
            if (  $text =~ /$section/ ) {
                $p->get_tag( "b" );
                my $data = $p->get_trimmed_text;
                print "$data\n";
                last;
            }
        }
    }
}